Abstract
The structure and the molecular motions of chemically crosslinked iPP samples have been analysed. The samples differ in gel content (i.e. degree of crosslinking). The X-ray analysis shows that two crystalline phases (α and γ) are present, their relative amount depending on the gel content. The thermal analysis suggests that the crosslinked samples are characterized by smaller and more defective crystals. The sample structure (in terms of crystallinity, phase composition and crystal defects) affects the molecular motion phenomena, analysed using the low resolution NMR spectroscopy. In particular, the analysis of the FID (free induction decay) signal shows a complex relationship between temperature, molecular mobility, and phase composition, which agrees with the thermal data.
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